CN110176713A - A kind of high efficiency optically erasing method and device - Google Patents
A kind of high efficiency optically erasing method and device Download PDFInfo
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10084—Frequency control by seeding
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
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Abstract
The invention discloses a kind of high efficiency optically erasing method and devices, belong to technical field of ultrafast laser.The present invention does broadening processing to femtosecond pump light and femtosecond seed light first, then utilizes cascade β-BaB2O4(BBO) crystal amplifies.Pump light and signal phototiming collinear incident to first piece of bbo crystal after broadening, generate the signal light and ideler frequency light of amplification, it is filtered out after bbo crystal plus with resistance optical filter by signal light, the pump light of transmission inputs in second piece of bbo crystal with ideler frequency light to be further amplified, repeatedly.It is all made of band resistance optical filter after every level-one amplification and filters out signal light, only retains pump light and ideler frequency light.The present invention is changed by filtering out the amplified signal pulse of every level-one, the Energy Reversal that restrained effectively in optically erasing, significantly improves the energy conversion efficiency of system, facilitates the ideler frequency light pulse that high-energy is obtained in photoparametric amplifier.
Description
Technical field
The invention belongs to technical field of ultrafast laser, and in particular to a kind of high efficiency optically erasing method and device.
Background technique
The femto-second laser pulse of high-energy has extensively in fields such as ultra-fast optical, nonlinear optics and high field laser physics
Research and application prospect.Titanium sapphire (Ti:Sapphire) is the most Mainstream Broadband that can produce femtosecond pulse at present
Gain media can not also find the gain media that can be compared with it in another performance.Therefore current high energy femtosecond pulse
Generation wave band be limited in the visible narrow regions to near-infrared substantially, which greatly limits its application range, so needing
The generation wave band of ultrashort laser pulse is expanded.And optically erasing (Optical Parametric
Amplification, OPA) because its gain band is roomy, tunable range is wide, almost without fuel factor accumulation the advantages that, become
The preferred option of high-energy ultrashort pulse is converted to middle infrared band, exported nearly under the frequency of infrared femtosecond laser.Ultrashort height
The pulse of energy mid-infrared laser will open up the parameter space seldom explored so far in light laser and matter interaction field, from
And new opportunities are provided for people's developing new effect and new opplication.
Optically erasing, i.e., high-intensitive pump light and low-intensity seed light carry out difference frequency and act on obtaining a branch of new frequency
Ideler frequency light, this needs to meet the conservation of energy and phase matched in the process.Generally, in three-beam coupling regime, work as pump light intensities
When greater than signal light and ideler frequency light, energy can be transferred to the latter by pump light, i.e., realize amplification to two pulses；And works as and be amplified to
After to a certain degree, the intensity of signal light and ideler frequency light is more than pump light, and energy can then transmit in the opposite direction, i.e. generation energy is inverse
Conversion.Often there are also a large amount of energy not to be converted for pump light at this time.Which limits the transfer efficiencies of parameter amplifying system, no
Conducive to the high energy femtosecond pulse for generating its all band.
Summary of the invention
In view of the drawbacks of the prior art, of the invention to provide a kind of high efficiency optically erasing method and device, mesh
Be inhibit the Energy Reversal in parametric process to change, to improve optical parameter by filtering out the resulting signal pulse of amplification
The energy conversion efficiency of amplifier.
The present invention provides a kind of high efficiency optically erasing methods, method includes the following steps:
(1) femtosecond pulse is generated, and the femtosecond pulse is divided into the different two-beam of energy, light beam is pumped as femtosecond
Pu light, another light beam is as femtosecond seed light；
(2) chirp pump light is obtained after being broadened the femtosecond pump light, and the femtosecond seed light is broadened
Chirp seed light is obtained afterwards；
(3) synchronous collinear incident is non-to first after being collimated the chirp pump light respectively with the chirp seed light
First order optically erasing is carried out in linear crystal, obtains the ideler frequency light of the pump light of decaying, the signal light of amplification and amplification；
(4) it filters out pump light and ideler frequency light to be input to jointly in latter block of nonlinear crystal after the signal light and carries out
I grades of optically erasings obtain the pump light further decayed, the signal light being further amplified and the ideler frequency light being further amplified；
Wherein, i is the integer more than or equal to 2 and less than or equal to N；
(5) long wave pass filter filtering pump light and signal light are utilized after carrying out N grades of optically erasings, are obtained pure
The ideler frequency light pulse of femtosecond pulsewidth and millijoule grade high-energy；Wherein, N is the positive integer greater than 2.
Further, in step (1), the high light beam of energy is as femtosecond pump light, the low light beam light of energy
Femtosecond seed light is generated by seed light generating device.
Further, in step (4), the signal light is filtered out using band resistance optical filter, the band resistance optical filter
Optical filtering wave band is signal light wave band.Therefore signal light is filtered out, and the Energy Reversal in secondary amplification changes process and is suppressed, it is ensured that
Effective conversion of the pump energy to ideler frequency light.
Further, the thickness of N number of nonlinear crystal is both needed to meet: the nonlinear crystal in every level-one makes ideler frequency light
Energy reaches close to saturation.
Further, cascade total level is then determined by actual conditions, in principle for, one piece of crystal ideler frequency of every increase
The energy conversion efficiency of light can further increase, but the speed improved can decline quickly, thus when improve speed it is lower when just not
It is further added by level.Preferably, 4 N.
The present invention also provides a kind of high efficiency optically erasing devices, comprising: femto-second laser, beam splitting device, seed
Light generating device, pump light stretcher, seed light stretcher, dichroscope, multistage amplifying unit and long wave pass filter；Femtosecond
Laser is for generating femtosecond pulse；Beam splitting device is used to femtosecond pulse being divided into the different two-beam of energy, light beam conduct
Femtosecond pump light, another light beam is as femtosecond seed light；Seed light generating device according to the femtosecond seed light for that will generate
Broadband seed light；Pump light stretcher is for exporting chirp pump light after broadening to the femtosecond pump light；Seed light exhibition
Wide device is for exporting chirp seed light after broadening to the broadband seed light；The dichroscope is for pumping the chirp
Pu light and the chirp seed light export after merging；It is more that the multistage amplifying unit is used for the output progress to dichroscope
The ideler frequency light of the pump light of decaying, the signal light of amplification and amplification is obtained after grade amplification；Long wave pass filter is for filtering out pumping
Light and signal light obtain the ideler frequency light pulse of pure femtosecond pulsewidth and millijoule grade high-energy.
Further, multistage amplifying unit includes: N number of bbo crystal and (N-1) a bandreject filtering piece；N number of bbo crystal
It is successively set on the optical axis of the emitting light path of the dichroscope, and a band resistance is set between each adjacent two bbo crystal
Filter plate；The light that bbo crystal is used to export dichroscope carries out optically erasing；Bandreject filtering piece is used for amplified light
Signal carries out filtering out chirp signal light and retains the processing of picosecond pump light and chirp ideler frequency light.
Wherein, the thickness of N number of bbo crystal needs to meet: each bbo crystal can be such that ideler frequency light is emitted in each crystal
Shi Nengliang reaches saturation.
Wherein, stating bandreject filtering piece enables to pump light and ideler frequency light completely through and signal light cannot penetrate.Therefore
By eliminating signal light, it is suppressed that the Energy Reversal in secondary amplification changes process, it is ensured that ideler frequency light obtains in subsequent crystallographic
Lasting amplification, realizes the efficient amplification of ideler frequency light.
The above technical scheme conceived by the present invention compared with prior art, by between cascade muti-piece BB0 crystal
Insertion band resistance optical filter is filtered, so that every grade of resulting signal light of amplification is filtered out, is avoided and is occurred in subsequent amplification
Energy Reversal changes process, so that the energy of pump light is converted to ideler frequency light as much as possible, mentions energy conversion efficiency significantly
It is high.
Detailed description of the invention
Fig. 1 is the structure chart of apparatus of the present invention.
Fig. 2 is the variation diagram for changing ideler frequency light energy conversion efficiency with nonlinear crystal effective thickness；Wherein, solid line is more
Block cascades bbo crystal high efficiency optically erasing as a result, dotted line is that traditional single BBO crystal amplifies result.
The variation diagram of gained ideler frequency optical pulse energy when Fig. 3 is different pumping energy；Wherein, square mark is cascade
The case where the case where bbo crystal amplifies, asterisk mark is single BBO crystal amplification.
Feature of the ideler frequency light in frequency domain and time domain when Fig. 4 show muti-piece cascade bbo crystal optically erasing；Wherein, scheme
It (a) is spectrogram, figure (b) is pulse envelope figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention carries out energy inverse transformation process effective under the premise of phase matched and Group-velocity Matching situation are constant
Inhibit, so that the efficiency of optically erasing has obtained improving by a relatively large margin.
The present invention proposes a kind of high efficiency optically erasing method, comprising the following steps:
(1) the high energy femtosecond pulse beam that femto-second laser generates is divided into two different beams of energy by beam splitting device
Light；The a branch of of higher-energy is used as femtosecond pump light in two-beam, and a branch of compared with low energy generates by seed light generating device
Femtosecond seed light；
(2) femtosecond pump light is broadened by pump light stretcher, obtains chirp pump light；Femtosecond seed light is by kind
Sub-light stretcher is broadened, and chirp seed light is obtained；
(3) by chirp pump light and chirp seed phototiming collinear incident to first block of nonlinear crystal, non-linear crystalline substance
Body carries out optically erasing, the signal light of the pump light, amplification decayed and the ideler frequency light of amplification to incident light；
(4) optical filter is hindered by band and filters out signal light, retain pump light and ideler frequency light；The two is inputted jointly second piece it is non-
Second level optically erasing is carried out in linear crystal, although ideler frequency light has reached saturation (energy conversion in first order amplification
Efficiency has reached maximum value when single-stage amplification), but since signal light being not present in the second level, and pump light still retains very
It is not busy to continue amplification so energy can still be shifted from pump light into ideler frequency light and newly generated signal light for big part energy
Frequency light pulse (i.e. the transfer efficiency of ideler frequency light gross energy is improved)；
(5) it after the second level is amplified, continues with band resistance optical filter and filters out signal pulse, retain pump light and ideler frequency
Light simultaneously amplifies in subsequent nonlinear crystal；Repeatedly, ideler frequency light gross energy transfer efficiency has after the amplification of every level-one
It is promoted, when promoting unobvious, stops increasing level；And the improved efficiency under multistage accumulation is extremely considerable, final utilization
Long wave pass filter filters out pure ideler frequency light, realizes the high efficiency amplification of ideler frequency light.
Based on the above method, the embodiment of the present invention proposes a kind of high efficiency optically erasing device, as shown in Figure 1, packet
Include femto-second laser 1, beam splitting device 2, seed light generating device 3, pump light stretcher 4, seed light stretcher 5, dichroscope
6, the first bbo crystal 7, the second bbo crystal 9, third bbo crystal 11, the 4th bbo crystal 13, band resistance optical filter 8,10,12 and length
Wave pass filter 14.It is the optimization of the energy based on output pulse and bandwidth that the present apparatus, which selects four pieces of bbo crystals, and four pieces can make
It obtains pulse and is amplified to higher energy, while the narrow of output spectrum will not be led to due to increasing excessive unnecessary amount of crystals
Change, correspondingly three pieces of bandreject filtering pieces is selected to filter out signal light between every two pieces of bbo crystals respectively.It, can be in practical operation
Bbo crystal quantity is chosen according to laser actual conditions, so that the energy conversion efficiency of ideler frequency light improves as far as possible, bandreject filtering piece
Quantity remains bbo crystal quantity and subtracts 1.
Femto-second laser 1 generates ultrashort high energy femtosecond pulse, is divided into two bundles the different light of energy by beam splitting device 2；Its
The light beam of middle high-energy obtains chirp pump light by pump light stretcher 4；The light beam of low energy passes through seed light generating device 3
Broadband seed light is generated, seed light obtains chirp seed light using seed light stretcher 5；Chirp pump light and chirp seed light
Merged by dichroscope 6, synchronizes and be input to progress first order amplification in the first bbo crystal 7；The first order, which is amplified, to be decayed
Pump light, the signal light of amplification and ideler frequency light, after band hinders optical filter 8, signal light is filtered out, and pump light and ideler frequency light are saturating
It crosses, and is input in the second bbo crystal 9 and carries out second level amplification.The signal light that the second level is amplified is by band resistance optical filter 10
It filters out, the pump light and ideler frequency light of transmission, is input in third bbo crystal 11 and carries out third level amplification.The third level is amplified to obtain
Signal light filtered out by band resistance optical filter 12, the pump light and ideler frequency light of transmission are input in the 4th bbo crystal 13 and carry out the 4th
Grade amplification.Final resulting pump light, signal light and ideler frequency light pass through long wave pass filter piece 14, and pump light and signal light are filtered
It removes, extracts pure femtosecond pulsewidth, millijoule grade high-energy ideler frequency light pulse.
In the above high efficiency optically erasing device, pump light stretcher and seed light stretcher respectively by pump light and
The width tension of seed optical pulse, so that two pulses that are stretched have similar pulsewidth in the time domain, pulsewidth amount of tension is by swashing
The group velocity walkoff of the light intensity and three-beam of light in the medium determines that stretching can excessively make laser intensity is too low so that ideler frequency light is difficult
To reach saturation, stretching deficiency then will lead to three-beam and be opened too early in the time domain, and laser can be usually pulled up to 100 femtoseconds
To the pulse duration range of 10 picosecond magnitudes.
The thickness of four pieces of bbo crystals need to be determined respectively by rudimentary time to high level according to amplification situation, determine that principle is: every
The crystal thickness of level-one will be such that ideler frequency light energy reaches in this grade amplification close to saturation.The cutting angle one of four pieces of bbo crystals
It causes, is determined according to the wavelength of pump light, signal light and ideler frequency light, meet identical phase-matching condition.With this condition, signal
Light and ideler frequency light amplify same central wavelength in each piece of bbo crystal, it is ensured that effective conversion of energy.If using different
Cutting angle, then signal light and ideler frequency light are amplified different wavelength components in every piece of crystal, practical to be simultaneously not up to saturated
Effect, therefore influence whether the efficiency of amplification.In actual application, it can be made more accurately to meet by rotating bbo crystal
The demand of phase-matching condition.
Compared with conventional optically erasing scheme, one aspect of the present invention introduces chirp to pump light, has drawn high its pulsewidth,
Pulse is allowed comprising higher energy, to improve the energy expansibility of system in the time domain；On the other hand using band resistance
Filter plate has filtered out the signal light of saturation, it is suppressed that and the Energy Reversal in subsequent amplification process changes effect, so that ideler frequency light
Transfer efficiency greatly improves.The energy conversion efficiency of system is improved under the premise of high pumping energy, to be relatively beneficial to produce
The ideler frequency light pulse of raw high-energy.
For further description high efficiency optically erasing method and device provided in an embodiment of the present invention, tie below
Details are as follows for conjunction attached drawing and specific example:
Using femtosecond titanium precious stone laser regenerative amplifier as femtosecond laser source, generation pulsewidth is 20 femtoseconds, single pulse energy
For 10.2 millijoules, central wavelength is 800 nanometers, and repetition rate is the femto-second laser pulse of 1 kHz；It will be total using beam splitting device
It is the two-beam of 10 watts and 0.2 watt that light beam, which is divided into power respectively,.Wherein 10 watts of light beam is directly as pump light；0.2 watt of light
Beam individually carries out an optically erasing, generates 30 femtosecond of pulsewidth, the micro- coke of single pulse energy 1, and 1400 nanometers of central wavelength put
Big signal light is as seed optical pulse.Pump light stretcher introduces 4000 femtoseconds to femtosecond pump light2Chirp, seed light broadening
Device introduces -5700 femtoseconds to femtosecond seed light2Chirp, obtain pulsewidth respectively may be about 550 femtoseconds chirp pump light and 525 fly
The chirp seed light of second.Two-beam is merged, is that OPA amplification is situated between with 1.75 millimeters of the first bbo crystal of a type-Ⅱphase matching
Matter, crystal-cut angle are θ=20 °, and φ=0 ° meets the phase matched item of 800 nanometers of pump lights and 1400 nanometers of seed lights
Part.Since amplified signal light wave band is not overlapped with pump light and the wave band of ideler frequency light, filtered using one piece of band resistance
Signal light (1600 nanometers or less) can be filtered out 99.5% by piece, pump light through 99% and 99% ideler frequency light, for subsequent
Amplification.Second bbo crystal with a thickness of 0.7 millimeter, third bbo crystal with a thickness of 0.7 millimeter, the 4th bbo crystal with a thickness of
1.0 millimeters, ideler frequency optical pulse energy is made to reach saturation in each piece of crystal respectively.It finally will using one piece of long wave pass filter
1600 nanometers of wavelength ingredients (pump light and signal light) below filter out, and only retain long wavelength, the ideler frequency light pulse of high-energy is made
For final output.
Fig. 2 amplifies resulting ideler frequency light conversion under the conditions of giving the cascade bbo crystal in single BBO crystal and the present apparatus
Efficiency with effective crystal thickness situation of change.Solid line shows in single BBO crystal in Fig. 2, and ideler frequency light is in 1.6 milli of crystal
Persistently amplified before meter Hou Du, saturation, transfer efficiency 26.9% is reached at 1.6 mm of thickness, respective pulses energy is
3.2 millijoule.With the further growth of crystal thickness, presence and the two intensity due to signal light and ideler frequency light are more than pumping
Light, it will the inverse conversion that energy occurs causes the reduction of ideler frequency light energy.In contrast, the cascade bbo crystal that dotted line is shown is then
The generation for avoiding inverse transformation process, after the amplification of the first bbo crystal reaches saturation, ideler frequency light is in subsequent three pieces of crystal
Continue to be amplified, final achievable 38.2% energy conversion efficiency, pulse energy is 3.82 millijoules, compared with single BBO crystal
Situation improves 44.2%.According to the central wavelength ratio of pump light, signal light and ideler frequency light, ideler frequency light theoretically be can achieve
Highest transfer efficiency be 41.8%, so cascade bbo crystal amplifies resulting 38.2% ideler frequency light conversion efficiency ten
Tap nearly theoretical limit.
Under conditions of Fig. 3 gives different pumping pulse energy, the optical parameter of single BBO crystal and cascade bbo crystal
The resulting output ideler frequency optical pulse energy of amplifying device.It can be seen from the figure that with the raising of pump energy, two kinds of devices
Resulting ideler frequency optical pulse energy can get a promotion, and in contrast, cascade the energy conversion efficiency of the scheme of bbo crystal always
It is higher by the scheme of single BBO crystal.Under conditions of 50 millijoule pump energy, this programme can achieve the conversion close to 40%
Efficiency, to generate the ideler frequency light pulse that energy is up to 20 millijoules.
Fig. 4 gives the frequency spectrum and temporal envelope of output ideler frequency light pulse under conditions of 10 millijoule pump energies.Fig. 4 (a)
For spectrum of the ideler frequency light pulse on frequency domain, 1600 nanometers are covered to 2400 nanometer ranges, the full width at half maximum of frequency spectrum is about 455
Nanometer；Correspondingly, the Fourier's extreme pulse widths of pulse in the time domain are about 17 femtoseconds.
The above result shows that carrying out continuing amplification to ideler frequency light by cascade nonlinear crystal, while non-at every two pieces
It is inserted into band-block filter part between linear crystal and eliminates signal light, may be implemented to change the Energy Reversal during optically erasing
The inhibition of effect enables ideler frequency light pulse to be amplified as much as possible, and the final high-energy obtained close to theoretical limit is converted
Efficiency.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of high efficiency optically erasing method, which comprises the following steps:
(1) femtosecond pulse is generated, and the femtosecond pulse is divided into the different two-beam of energy, light beam is pumped as femtosecond
Light, another light beam is as femtosecond seed light；
(2) chirp pump light is obtained after being broadened the femtosecond pump light, is obtained after the femtosecond seed light is broadened
Obtain chirp seed light；
(3) synchronous collinear incident is non-linear to first after being collimated the chirp pump light respectively with the chirp seed light
First order optically erasing is carried out in crystal, obtains the ideler frequency light of the pump light of decaying, the signal light of amplification and amplification；
(4) it filters out pump light and ideler frequency light to be input to jointly in latter block of nonlinear crystal after the signal light and carries out i-stage
Optically erasing obtains the pump light further decayed, the signal light being further amplified and the ideler frequency light being further amplified；Its
In, i is the integer more than or equal to 2 and less than or equal to N；
(5) long wave pass filter filtering pump light and signal light are utilized after carrying out N grades of optically erasings, obtain pure femtosecond
The ideler frequency light pulse of grade pulsewidth and millijoule grade high-energy；Wherein, N is the positive integer greater than 2.
2. high efficiency optically erasing method as described in claim 1, which is characterized in that in step (1), energy it is high one
Shu Guang generates femtosecond seed light by seed light generating device as femtosecond pump light, the low light beam light of energy.
3. high efficiency optically erasing method as claimed in claim 1 or 2, which is characterized in that in step (4), utilize band
Resistance optical filter filters out the signal light, and the optical filtering wave band of the band resistance optical filter is signal light wave band.
4. high efficiency optically erasing method as described in any one of claims 1-3, which is characterized in that N number of nonlinear crystal
Thickness be both needed to meet: the nonlinear crystal in every level-one reaches ideler frequency light energy close to saturation.
5. high efficiency optically erasing method according to any one of claims 1-4, which is characterized in that N 4.
6. a kind of high efficiency optically erasing device characterized by comprising femto-second laser (1), beam splitting device (2), seed
Light generating device (3), pump light stretcher (4), seed light stretcher (5), dichroscope (6), multistage amplifying unit and long wave
Pass filter (14)；
The femto-second laser (1) is for generating femtosecond pulse；
The beam splitting device (2) is used to for the femtosecond pulse being divided into the different two-beam of energy, and light beam is pumped as femtosecond
Light, another light beam is as femtosecond seed light；
The seed light generating device (3) will be for that will generate broadband seed light according to the femtosecond seed light；
The pump light stretcher (4) is for exporting chirp pump light after broadening to the femtosecond pump light；
The seed light stretcher (5) is for exporting chirp seed light after broadening to the broadband seed light；
The dichroscope (6) after merging the chirp pump light and the chirp seed light for exporting；
The multistage amplifying unit is used for the output to dichroscope (6) and carries out obtaining the pump light of decaying after multistage amplification, put
The ideler frequency light of big signal light and amplification；
The long wave pass filter (14) is used for filtering pump light and signal light, obtains pure femtosecond pulsewidth and millijoule grade is high
The ideler frequency light pulse of energy.
7. high efficiency optically erasing device as claimed in claim 6, which is characterized in that the multistage amplifying unit includes: N
A bbo crystal and (N-1) a bandreject filtering piece；
N number of bbo crystal is successively set on the optical axis of the emitting light path of the dichroscope (6), and each adjacent two bbo crystal
Between be arranged a bandreject filtering piece；
The light that bbo crystal is used to export dichroscope (6) carries out optically erasing；
Bandreject filtering piece is used to carry out filtering out chirp signal light to amplified optical signal and retains picosecond pump light and chirp spare time
The processing of frequency light.
8. high efficiency optically erasing device as claimed in claim 7, which is characterized in that the thickness of N number of bbo crystal need to expire
Foot: energy reaches saturation when each bbo crystal can be such that ideler frequency light is emitted in each crystal.
9. high efficiency optically erasing device as claimed in claim 7 or 8, which is characterized in that the bandreject filtering piece can
So that pump light and ideler frequency light are completely through and signal light cannot penetrate.
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| CN111822850A (en) * | 2020-07-17 | 2020-10-27 | 西安交通大学 | Multi-beam laser amplification scanning processing system and method based on light field regulation |
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| CN116051584A (en) * | 2023-01-13 | 2023-05-02 | 哈尔滨理工大学 | Method and device for generating infrared scene at target edge and detecting edge with high efficiency |
| CN117388861A (en) * | 2023-10-10 | 2024-01-12 | 中国科学院西安光学精密机械研究所 | Weak light signal detection method and system based on phase-sensitive optical parametric amplification |
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